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app.go
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app.go
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package app
import (
"context"
"fmt"
"os"
"os/signal"
"syscall"
"time"
"github.com/castai/kvisor/pkg/logging"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/flowcontrol"
)
type Config struct {
Version string
Log *logging.Logger
Kubeconfig string
ThiefDelay time.Duration
ThiefInterval time.Duration
}
func New(cfg *Config) (*App, error) {
log := cfg.Log
return &App{
cfg: cfg,
nodeName: os.Getenv("NODE_NAME"),
log: log,
}, nil
}
type App struct {
cfg *Config
nodeName string
log *logging.Logger
}
func (a *App) Run(mode string) error {
ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
defer stop()
switch mode {
case "controller":
log := a.log
kubeConfig, err := getKubeConfig(log, a.cfg.Kubeconfig)
if err != nil {
log.Fatal(err.Error())
}
kubeConfig.RateLimiter = flowcontrol.NewTokenBucketRateLimiter(float32(25), 100)
clientset, err := kubernetes.NewForConfig(kubeConfig)
if err != nil {
return err
}
ctrl := newController(a.log, clientset)
return ctrl.run(ctx)
case "thief":
t := newThief(a.log, a.cfg)
return t.run(ctx)
default:
runner := newEventRunner(a.log)
if err := runner.run(ctx); err != nil {
a.log.Errorf("event failed: %v", err)
}
return nil
}
}
func getKubeConfig(log *logging.Logger, kubepath string) (*rest.Config, error) {
if kubepath != "" {
data, err := os.ReadFile(kubepath)
if err != nil {
return nil, fmt.Errorf("reading kubeconfig at %s: %w", kubepath, err)
}
restConfig, err := clientcmd.RESTConfigFromKubeConfig(data)
if err != nil {
return nil, fmt.Errorf("building rest config from kubeconfig at %s: %w", kubepath, err)
}
log.Debug("using kubeconfig from env variables")
return restConfig, nil
}
inClusterConfig, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
log.Debug("using in cluster kubeconfig")
return inClusterConfig, nil
}